Riparian plantings help remove nitrates from waterways, through the addition of organic matter and the process of denitrification.
This video highlights the ecological value of planting both sides of a waterway.
While doing some post-restoration monitoring in Cashmere Stream, Derek Gerber spotted this lamprey returning from the sea to spawn.
This is Avon Park, where Christchurch City Council has recently completed a major project to re-engage the river with its floodplain.